OK. Seth seems most correct. However, there are two definitions of meteor that seem relevant: the ball of rock (meteroid or meteorite) and the “shooting star” or fileball that it creates. Wouldn’t “meteoriticist only apply to the former?

It’d really depend on ones interest area in meteorites. For instance, composition study could be Astrominerology or Xenominerology to further distinguish its extraterrestrial interests within Minerology, or Xenobiology if (perpetually fruitlessly) investigating for signs of organic life and compounds. But just about everything up until impact would fall under a flavor of Physics, barring the chemistry of burning.